Combined switch and brush holder



July 7, 1931. F, c, DE REAMER 1,813,889

COMBINED SWITCH AND BRUSH HOLDER Filed Sept. 18, 1930 Inventor- FranK C. DeReamer;

L-J W His Attorney Patented July 7, 1931 UNITED STATES PATENT OFFICE.

FRANK C. DE REAME R, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO GENERAL ELEC- TRIC COMPANY, A CORPORATION OF NEW YORK COMBINED SWITCH AND BRUSH HOLDER Application filed September 18, 1930. Serial No. 482,796.

The present invention relates to electrical circuit breakers, but more particularly to circuit breakers used in conjunction with small electric motors. The object of my invention is to provide a neat and compact combined circuit breaker and brush holder for electric motors and whereby the supply and control of electric current to motors is simplified.

For a better understanding of my invention, reference may be made to the accompanying drawings showing one embodiment thereof in which Fig. 1 is a vertical section of my combined switch and brush holder 5 taken on line 11 of Fig. 2; Fig. 2 is a rear elevation showing theside of the brush holder which is mounted adjacent the motor commutator; Fig. 3 is a rear elevation of the switch; Fig. 4 is a perspective of a motor with the combined switch and brush holder attached thereto, and Fig. 5 is a diagram of the electrical circuit.

The brush holder, as shown, consists of a recessed block 5 of insulating material pro vided with two integral and diagonally disposed metal bosses 6, internally threaded for the reception of flanged guide tubes 7 in which the carbon brushes 8 are mounted to move freely back and forth under the reaction of helical springs 9 disposed within the bosses 6 at their inner ends while the outer ends of the brushes 8 bear upon the commutator segments 10.

The upper end of the block 5 is provided withv an. opening for entrance of the power supply wires 11 and 12, one of which, 11 has its end coiled about a guide tube 7 and clamped between the end of the boss 6 and the tube flange upon screwing the tube home in the boss. The other wire 12 is attached to a binding post 13 secured in a rear recess of the block by a screw 14 which engages with a switch holding plate at the front of the block 5.

The switch 15 comprises a support in the form of a box-shaped housing 16 ot' insulation open at its right hand or rear side and closed at the front side in which is a vertical slot 17 through which the switch thumb piece 18 projects. The walls of the housing 16 at the inside lower corners are provided with integral blocks 19 in which eyelets 20 and 21 are embedded. The eyelet 20 is riveted over a holding plate 22 provided at its free end with a threaded screw hole.

Stationary switch contacts 23 and 24 are. disposed between the corner blocks It) and securely anchored thereto. contact 91' being secured by the eyelet 21 and contact bv the holding plate 22 respectively. The movable switch contact 25 is adapted to enter between the contacts 23 and 24 and make bridging contact therewith. The eyelet 21 is internally threaded for engagement with the screw 14 extending through the brush holder block 5. and the screw hole in the free end of the holding plate 22 engages with a screw .26 extending through block 5 and the inner end of the lower metal boss 6 and serving to electrically connect those parts so that current may pass from supply wire 12 through the binding post 13, screw 14, stationary contact 24, movable switch contact 25. stationary contact 23, holding plate 22, screw 26 to the second brush boss 6.

By reason of the holding plate 22 and the threaded eyelet 21 being fixedly secured'to the switch housing 16. screws 14 and, 26 also serve mechanically to connect together the switch housing 16 and the brush holder block 5.

After the supply circuit wires 11 and 12 have been attached to the rear of the brush holder, the latter is in condition for assembly upon the frame of the motor which, as indicated in Fig. 4, is accomplished by means of two set screws 27 extending through apertures 28 in the ends of the holder block 5 and engaging holes tapped in the motor frame 29.

In my combined switch and brush holder, the supply circuit wires are connected to the rear side of the brush holder where assembly is easily accomplished and inspection thereof readily had whenever repair or renewal of brushes is made. Also the switch is assem bled in permanent enclosed relation thereto without involving wires or other loose connection between it and the brush holder. 7

lVhatI claim as new and desire to se- M cure by Letters Patent of the United States, 1s:-

1. The combination of a brush-holder block provided on the rear side with metallic means 5 for supportin a pair of brushes, means for attachment 0 a circuit wire to one of said brush-supporting means, a binding post mounted on the rear side of said block for connection with a second circuit Wire, a switch mounted on the front side of said block and provided with two stationary contacts respectively connected through the brush-holder block to said binding post and to the second of the pair of brush supports. 5 2. The combination of a brush-holder block provided on the rear side with a pair of metallic supports for brushes, means for attachment of a circuit wire to one of said brush su ports, a binding post located on the rear side of said brush-holder block for attachment of a secondcircuit wire, an electric switch provided with an insulative support, stationary contacts fixed to said insulative support, and metallic attachment means respectively connecting said stationary contacts to said binding post and to the second of the pair of brush supports.

3. The combination of a brush-holder block provided on the rear side with a pair of metallic supports for brushes, means for connecting a supply wire in circuit with one of said brushes, a binding post for the other supply wire located at the rear side of said a block, an electric switch disposed on the V V front side of said block and provided with a a supporting housing, stationary switch coni tacts fixed to said housing, and screws passing through said block and electrically and mechanically connecting respectively said 2;;5inding post to one of said stationary contacts and the second of said air of metallic brush supports to the other 0 said stationary contacts-i In witness whereof, I have hereunto set my hand this 16th da of Se tember, 1930.

FR NK DE REAMER. 

